Supporting structure for a mould for a concrete structure



Feb. 5, 1957 c; VAN DEN BOS 2,779,990

SUPPORTING STRUCTURE FOR A MOULD FOR A CONCRETE STRUCTURE Filed April 1,1952 l lo INVENTOR cme/veL/a 49 249v 30$ United States atent SUPPORTINGSTRUCTURE FOR A. MOULD FOR A CONCRETE STRUCTURE The present inventionrelates to a supporting structure for a mould for a concrete structurewherein the supporting surface can be dimensionally altered and isdefined by a number of bars which are connected together in parallelrelationship.

Such a supporting structure is generally known. However, in the existingstructures, the connection of the bars consists of other rigid barsrotatably connected therewith, and an alteration in width alwaysaccompanies each alteration in length of the structure. It has appearedin practice that this may lead to undesired complications when preparingsuch supporting structures.

In order to obviate this drawback the supporting structure according tothe invention consists in a mechanism permitting movement of theparallel, laterally extending bars toward and away from each other whilemaintaining the same distance between the two opposite sides of thesupporting structure.

In a preferred embodiment according to the invention the mechanismconnecting the bars to permit movement toward and away from each otherconsists in at least two elements of the lazy tongs type, with thecentres of rotation of each set of crossing members of the lazy-tongsbeing connected to the parallel bars and the lazy-tong elementsextending longitudinally in parallel, spaced-apart relationship.

In the drawings embodiments of the supporting structure according to theinvention are indicated by way of example:

Figure 1 shows a plan view of a part of a supporting structure inpartially drawn out position.

Figure 2 represents a cross section along the line II--H in Figure 1.

Figure 3 is a cross section along the line III--III in Figure 1.

Figure 4 is a lateral view of another embodiment.

Figure 5 is a plan view of still another embodiment.

In the drawings, the bars are indicated by the reference numeral 1. Thebars 1 extend laterally and are connected to each other bylongitudinally extending lazy-tongs 2a and 2b. The centers of rotation 3of the crossing members 4 and 5 forming the lazy-tongs are located onthe neutral axes of the lateral bars 1.

The members 4 and 5 extend through openings 6 in the bars 1. Each of thebars 1 can also consist of two or more parts arranged. against eachother, and each provided with registering recesses at the inside for thepassage of the lazy tongs. a

The head ends 7 (Figure 3) of each bar 1 are provided with transverserecesses 8 into which the lazy-tongs of an adjacent similar oar system(not shown) can enter when the end portions of the bars in adjacent barsystems are overlapped.

ICE

In one embodiment (Figure 4) thin shields (9) are fitted on the bars 1which shields overlap each other like tiles and so seal the openingsbetween the various bars. it is to be understood that the bars 1 of Fig.4 are also connected by lazy-tong elements, and that the shields 9 merly replace flat plates or boards that must be supported by the structureof Figs. 1 to 3 to define a mould.

In another embodiment members 10 (Fig. 5) are mounted perpendicularly tothe bars 1 and, if desired, pass through openings in said bars.

These members 10 which e. g. are formed as strips, bridge over theopenings between the bars 1 and give a better support to the coveringmaterial of the mould.

The above described supporting structures can be applied in rectangularplanform as well as in the form of a parallelogram. Dependent upon theresiliency of the bars and/or the lazy tongs bent faces in the mouldscan also be supported with the above described structure.

When using slightly resilient covering material the distance between thebars can be chosen as large as possible.

When using sheet-like material the bars can be connected in such amanner that no or only slight bending of this material is to be feared.

What is claimed is:

1. A supporting structure for poured concrete moulds; said structurecomprising a series of spaced apart elongated bars extending laterallyin the structure, and at least two laterally spaced independentlazy-tong elements extending longitudinally in the structure, each ofsaid lazy-tong elements including sets of crossing members, and pivotsconnecting together said crossing members of each lazy-tong element attheir opposite ends and at their intersections, the pivots of saidcrossing members at said intersections being also pivotally connected tosaid bars so that said bars are supported solely by said lazy-tongelements and can be moved toward and away from each other to vary thelongitudinal dimension of the structure while maintaining a constantlateral dimension and so that the bars can be angularly displacedrelative to each other to give said structure a fan-like configuration.

2. A supporting structure according to claim 1; wherei in said bars haveslots therethrough through which said lazy-tong elements extend andwherein said lazy-tong elements are pivotally connected to said bars.

3. A supporting structure according to claim 1; further comprisingshield members securedto each of said bars and spanning the gaps betweenthe latter to overlap in one direction and define a surface of a mouldfor poured concrete.

4. A supporting structure according to claim 1; further comprisingstiffening members extending at right angles from each of said bars andengageable with the next adjacent bar to stiifen the structure when saidlazy-tong elements are extended. a

. References Cited in the file of. this patent

